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NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    A hypothetical reaction \[{{A}_{2}}+{{B}_{2}}\xrightarrow{{}}2AB\] follows the mechanism as given below:
    \[{{A}_{2}}A+A\] (fast)
    \[A+{{B}_{2}}AB+B\] (slow)
    \[A+BAB\] (fast)
    The order of the overall reaction is:

    A)  2                                

    B)  1

    C)  \[1\frac{1}{2}\]           

    D)  0

    Correct Answer: C

    Solution :

        From slow step, rate \[=K[{{B}_{2}}][A]\] \[\because \]      \[{{A}_{L}}A+A\]                 \[{{K}_{eq}}=\frac{{{[A]}^{2}}}{[{{A}_{2}}]}\]                \[[A]=\sqrt{{{K}_{eq}}[{{A}_{2}}]}=K_{eq}^{{\scriptstyle{}^{1}/{}_{2}}}\,\,A_{2}^{{\scriptstyle{}^{1}/{}_{2}}}\] rate \[K[{{B}_{2}}]\,K_{eq}^{{\scriptstyle{}^{1}/{}_{2}}}\,{{[{{A}_{2}}]}^{{\scriptstyle{}^{1}/{}_{2}}}}={{K}^{1}}{{[{{A}_{2}}]}^{{\scriptstyle{}^{1}/{}_{2}}}}[{{B}_{2}}]\] Hence,     order \[=1\frac{1}{2}\]     


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